[UPDATE] [high] Red Hat Enterprise Linux (corosync): Multiple vulnerabilities allow Denial of Service

An attacker can exploit multiple vulnerabilities in Red Hat Enterprise Linux (corosync) to perform a Denial of Service attack.

CSIRTS triage

What: Corosync in Red Hat Enterprise Linux contains multiple vulnerabilities allowing denial of service attacks.
Who is affected: All RHEL deployments using corosync are affected.
Urgency: High priority; high severity rating and DoS impact on critical cluster infrastructure.
Action: Apply security updates for CVE-2026-35091 and CVE-2026-35092 immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-350910.87% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 56% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-350920.99% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 60% of all EPSS-scored CVEs.

CVE	CSIRTS overview	External
CVE-2026-35091	coverage & exploitation status	NVD · CVE.org
CVE-2026-35092	coverage & exploitation status	NVD · CVE.org

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.